"William Donzelli" wrote in message
om...
"Keith Willshaw" wrote in message
...

The equipment used was apparently restricted to the range
60 Hz to 4500 Hz

The microphones and interphone equipment, on the other hand, had a
frequency response of roughly 300-3000 Hz. Depending on the type of
microphone used (T-17, T-44, British HI, or a zillion others - the
Station Boxes (probably Bendix MI-22s) could handle lots of different
types of microphones), the response characteristics might be a little
different, but not much. The interphone amplifier likely also has a
filter to supress anything out of the 300-3000 Hz range. There were
noise cancelling mikes back then, but they were not very good.

Did someone mention a disc recorder being used? Frankly, I can not
think of anything worse to take on a big bomber. The virbrations from
the engines would go right thru to the cutting head mechanically, even
with a good shockmount.


They did use a disc recorder for the simple reason that was
all they had available , the sound engineer reported having
to keep the blank discs inside his flight suit to keep them
warm enough to cut.

see
http://www.roger.beckwith.btinternet...r/wr_intro.htm
and
http://www.roger.beckwith.btinternet..._recorders.htm
http://www.roger.beckwith.btinternet.../wr_midget.htm

Keith